import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

public class SemaphoreDemo {

    public static void main(String[] args) {
        Semaphore semaphore =new Semaphore(2);
        for (int i = 1; i <= 6; i++) {
            new Thread(()->{
                try {
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName()+"\t 抢到车位");
                    try{
                        TimeUnit.SECONDS.sleep(3);
                    }catch (InterruptedException e){
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName()+"\t 停车3秒后离开车位");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally {
                    semaphore.release();
                }
            },String.valueOf(i)).start();
        }


    }
}
